An apparatus for cooling and containing packaged battery cells includes a first structure disposed on a printed circuit board for encasing a first battery cell, the first battery cell being electrically coupled to the circuit board, the first structure includes an external surface and an internal surface defining a first cavity in which the first battery cell is located. The apparatus further includes a first seal surrounding the first battery cell between the printed circuit board coupled to the first structure. The apparatus further includes a first thermal interface material located in the first cavity, wherein a first portion of the first thermal interface material is thermally coupled to an interior surface and a second portion of the first thermal interface material is thermally coupled to the first battery cell. The apparatus further includes a plurality of heatsink fins located on the external surface of the first structure.